/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.rpc.serializer;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import io.protostuff.LinkedBuffer;
import io.protostuff.ProtostuffIOUtil;
import io.protostuff.Schema;
import io.protostuff.runtime.RuntimeSchema;

/**
 * ProtoStuffUtils
 */
public class ProtoStuffUtils {

  private ProtoStuffUtils() {
    throw new IllegalStateException("Utility class");
  }

  private static LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);

  private static Map<Class<?>, Schema<?>> schemaCache = new ConcurrentHashMap<>();

  @SuppressWarnings("unchecked")
  public static <T> byte[] serialize(T obj) {
    Class<T> clazz = (Class<T>) obj.getClass();
    Schema<T> schema = getSchema(clazz);
    byte[] data;
    try {
      data = ProtostuffIOUtil.toByteArray(obj, schema, buffer);
    } finally {
      buffer.clear();
    }
    return data;
  }

  @SuppressWarnings("unchecked")
  private static <T> Schema<T> getSchema(Class<T> clazz) {
    return (Schema<T>) schemaCache.computeIfAbsent(clazz, RuntimeSchema::createFrom);
  }

  public static <T> T deserialize(byte[] bytes, Class<T> clazz) {
    Schema<T> schema = getSchema(clazz);
    T obj = schema.newMessage();
    if (null == obj) {
      return null;
    }
    ProtostuffIOUtil.mergeFrom(bytes, obj, schema);
    return obj;
  }
}
